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Louisiana oil rig explosion

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Response boats work to clean up oil where the Deepwater Horizon oil rig sank off Louisiana on April 22. The oil drilling rig that had burned for 36 hours in the Gulf of Mexico sank Thursday as hopes dimmed for 11 missing workers and the risk of a major oil spill loomed, officials said. U.S. Coast Guard/Reuters

Debris and oil from the Deepwater Horizon drilling platform float in the Gulf of Mexico after the rig sank off Louisiana on April 22. US Coast Guard/Reuters

Response boats work to clean up oil where the Deepwater Horizon oil rig sank off Louisiana on April 22. US Coast Guard/Reuters

Fire boat response crews battle the blaze at the off shore oil rig Deepwater Horizon off Louisiana on April 21. Eleven workers were missing still at the Transocean oil drilling rig. Crews were still fighting the fire 16 hours after the explosion on Wednesday. US Coast Guard/Reuters

Stanley Murray (l.) father of Chad Murray, a crewman rescued from the Deepwater Horizon oil rig that exploded in the Gulf of Mexico, hugs the loved one of a crew member reported missing, after the surviving crew arrived at a hotel in Kenner, La., on April 22. Gerald Herbert/AP

The Deepwater Horizon oil rig is seen burning on April 21 off Louisiana in the Gulf of Mexico. Gerald Herbert/AP

Workers rescued from the Deepwater Horizon oil rig depart from Port Fourchon, La., on April 22. Buses carrying the survivors of the explosion on the oil platform headed to a suburban New Orleans hotel where family members were waiting to greet them. Patrick Semansky/AP

Leaked oil is seen surrounding the Deepwater Horizon oil rig off Louisiana on April 21 as crews work to put out the fire on the platform. Gerald Herbert/AP

Family members of Eugene Moss, who was on the Deepwater Horizon oil rig, await his arrival with fellow crew members who were safely evacuated from the off-shore oil platform on April 21. Gerald Herbert/AP

Fire blazes on the Deepwater Horizon oil rig on April 21. Gerald Herbert/AP

Fire boats work to put out the fire on the off-shore oil platform on April 21 as an oil slick from leaked oil is seen surrounding the rig. Gerald Herbert/AP

In Port Fourchon, La., Jonathan Eugene waits with his brother to find out where their family can pick up their father, a cook who was rescued from the Deepwater Horizon oil platform on April 21. Patrick Semansky/AP

This aerial photo shows the smoke rising from the Deepwater Horizon oil rig burning off the coast of Louisiana in the Gulf of Mexico on April 21. Gerald Herbert/AP

Boats work to put out the fire after the explosion on the oil rig in the Gulf of Mexico on April 21. Gerald Herbert/AP

Fire boats work to put out the fire on the Deepwater Horizon oil rig after an explosion there left 11 people missing on April 21. Gerald Herbert/AP

Smoke billows in the Gulf of Mexico from the oil rig fire that continues to burn off Louisiana's coast on April 21. Gerald Herbert/AP

In this image taken from US Coast Guard video, a Coast Guard MH-65C rescue helicopter and crew from the Coast Guard Air Station New Orleans hoist a survivor off a support vessel responding to the explosion aboard the Deepwater Horizon oil rig. US Coast Guard/AP

Medical staff wheel away a rescued oil worker on April 21 in this image taken from US Coast Guard video. At least 11 people were still missing after an explosion and fire at an off-shore oil-drilling platform in the Gulf of Mexico off Louisiana. US Coast Guard/APTN/AP

The fire aboard the Deepwater Horizon oil rig in the Gulf of Mexico blazes on April 21. Petty Officer Scott Lloyd/US Coast Guard/AP

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Hardline Islamist insurgents, including the Al Qaeda-linked Nusra Front, now control a second Syrian province after Raqqa, the stronghold of the Islamic State group. But ISIS isn't allied with the Islamists who tookover Idlib.

ByMariam Karouny, ReutersMarch 28, 2015

Islamist groups including Al Qaeda's Nusra Front - but not ISIS - have seized the city of Idlib for the first time in Syria's civil war, fighters and a monitoring group said on Saturday.